Installed 4.2 into my VZW 8703e this afternoon.

1. Device seems more sluggish when doing things like selecting applications, etc.

2. New Applications icon, which takes you to another Applications screen. This contains things like Gmail and other Google Services items, Blackberry Maps, Calculator, Beyond411, Quicknote, BBLight, Brickerbreaker (some of these are aftermarket items I already had, obviously). I don't like this setup - it now takes one more step to get to these applications.

3. New Media icon, which takes you to the Media screen (Ringtones and Pictures). You can now receive these things via Bluetooth. You can now go into media options and see what the file size is for each tone, picture, etc.
I see that my device has a 12MB memory limit.

4. New Tools icon, which takes you to the Tools screen, which contains Taks, MemoPad, Password Keeper, and Help.

5. New Settings icon, which takes you to the Settings screen, which contains E-mail Settings, Alarm, Screen/Keyboard, Mobile Network, Options, Set-up Bluetooth, and Turn Wireless Off.

6. Profiles menu looks different, and includes an Advanced menu choice, which takes you into the standard profile editor. Again, another step to impede you.

7. On the Verizon theme's red banner bar at the top (home screen), where the signal strength, battery level, Bluetooth, EVDO, and other indicators are, it sure looks like they've bumped up the font size of the day/date/time. Not alot, mind you, but at least it's a noticeable increase (unless I'm seeing things). If this is the case, I like it. I wish I could make it even bigger. (Maybe there's a way; I'm not done exploring.)

8. When the device locks, the Owner Info is now displayed in much smaller font. I don't know why they'd do this. I can't figure out if it's adjustable or not. Whatever...

9. In the Status screen (via options, or by simply pushing ALT, CAP, H in succession), the battery strength indicates 100%, but the battery level icon on the home screen shows 3/4 full. What's with this? I'll charge fully again and see what happens.

10. Some of the Blackberry ringtones, notifiers, alarms, etc. have changed. Some tones are gone, replaced by some new ones.

That's all I've noticed so far. I'm sure I'll discover other things, too. All in all, I don't see anything truly amazing. Perhaps I'm missing something. Others will certainly discover other items.