Been using the new Omnipods for a few weeks now and very impressed. Only time will tell for reliability but no issues with filling/priming/starting so far.
The new pods really are noticeably smaller and are definitely easier to get a wetsuit over - the adhesive seems to hold up better after prolonged immersion too. Reduced mass of the pods was also noticeable for the first couple of days, particularly when running and cycling on rough terrain. Coloured canula is also a nice touch and makes it far easier to check for problems.
Only downside so far is that they're way harder to get into; probably not an issue for most but I like to break 'em apart for recycling - needle & canula in sharps bin of course.
As for the PDM, physically there's no change other than the colour; it's now black. As for firmware, the only changes I've spotted so far are:
1. ID confirmation prompt at waking: when waking from sleep the PDM asks you to confirm that you're you - you have to give the PDM an ID at setup to facilitate this. I guess this is to avoid inadvertent swapping of PDMs if there's a gaggle of podders around.
2. Additional extended bolus options; think I spotted something about this in the manual but may be wrong. Will check again.
As for other features/changes, the blister packs are slimmer thus making it easier to carry spares. Also, filling needles are MUCH shorter to accommodate the thinner form of the pods.
That's all I can think of for now but I'm happy to answer question from anyone that's interested.