I see Passport Founder's Edition is showing Discontinued note, but can they still be used with latest firmware updates, and what are the main difference compared with Batch2 in main board level?
Case is much better in new model, as well as display, but I was asking about chips, processors and code.
The biggest differences are definitely the color IPS display and the integrated rechargable/replaceable battery, but overall operation is very similar now that firmware has been combined.
FE will get updates alongside Batch 2, so you should expect updates for quite some time!