Happy to help!
In regards to the interview process, its honestly fairly relaxed. You'll rock up on the day for a briefing session, then either go off and complete the MSA or the PQA, then switch. There will be a handfull of current students there to chat and help walk you through and make sure it all runs smoothly. As for the interview stations, most of them just involve an examiner in a room that asks you a few questions. It's a bit cliche, but honestly the most important thing is to try and relax and just treat it like a conversation. Some of the examiners are super chill and will joke around with you a bit, while some will be more focused (in my experience, it's pretty easy to get a feel for it in the first few seconds), but either way, they're people and they're not there to scare you!
Obviously I can't give away any specific info, so I'll just give a brief overview of the general theme of some of the stations you might encounter.
Some stations will just involve a chat about yourself, how you'd handle x situation, or your perspectives on a certain topic (general stuff, not really something you'd have to research beforehand). Some will have you look at a stimulus and then respond, some will involve you working on a task, or you might have a roleplay scenario. There also might be a station where you have to evaluate your performance in a previous station (this is the worst in my opinion lol).
It's very hard to give specific prep advice as a lot of the stuff covered in the stations will only be relevant to that station, if that makes sense? For example, if you have a specific stimulus that you have to respond to, its pretty hard to prepare in advance at all.
The only other real advice I can give is that recurrent themes seem to be volunteer experience, empathy, handling conflict, remaining calm/focused, & personal values.
Also, if you screw up one station, try not to stress! I thought I completely screwed up 2-3 stations and still got an offer. Its not necessarily whether you answer the question right or complete the task, but how you justify your response and handle yourself.
In regards to the program itself, its still in its infancy (2019 will only be the 3rd year of the JMP) so I'll try to provide the best overview I can, keeping in mind that my experience might differ from yours as changes are made based on feedback from this years cohort.
In short, theres definitely some issues and its nowhere close to perfect, but its still a great program. The first few weeks for me were really a bit of a mess in regards to timetabling and content, as they tried to give us a brief overview of a whole lot of content without making it clear what we needed to know, and it was a bit all over the place. About halfway through first sem, it started to become a bit more clear and structured content-wise as we focused in on cardiovascular/respiratory systems. There's still some timetabling/organisational issues (with the anatomy facilities in particular) but its definitely been improving as the year progresses and they've received A TON of feedback and suggestions on how to improve things for next year.
In regards to clinical experience, this year it consisted of half-days every fortnight at John Hunter Hosp teaching labs, where we went over physical examinations and history taking with sim patients (quite good, but again suffered from some organisational issues). I've heard rumours that next year our clinical experience will be on campus, and more frequent which will hopefully help resolve a lot of the problems that popped up. We have very limited interaction with actual patients in first year (except a few scattered sessions where we followed a doc around the hospital in small groups to familiarise ourselves with the hospital and stuff), but I actually find the sim patients really useful in that you treat them like an actual patient, but there's no pressure involved, & the ones we had this year were absolutely fantastic!
The biggest issues are definitely centered around the admin/organisational aspect of the program, but we've had feedback and info from staff that suggests they're definitely working on improvements for next year, so hopefully the issues that we ran into won't pop up again! I'm trying not to be too critical given that its such a new program, and I'm honestly pretty optimistic about next year as it seems as though they're heading in the right direction.
Sorry for the wall of text! I'm currently procrastinating studying for finals, so hopefully this is helpful