Just to put in some observations..
My pictures were able to sync, however I have somewhere around 200, so perhaps the amount of pictures has something to do with it.
The dictionary is working very well now, to include words typed by the user in the SMS field (something I hadn't seen functioning yet).
Things are working much smoother and snappier, with the exception of the jerky scrolling that occurs when you scroll slowly (saw this mentioned earlier) and the laggy text input in Safari (such as for this post).
Also, I'm noticing that every time I'm sending a text message, it always says "Sending message 2 of 2." This may be unique to me, however, so I'll try restarting to see if it fixes it.
Lastly, this may just be because I skipped out on beta 3 and wasn't accost accustomed to the beta battery life for a week or two - but the battery seems to be draining a tad bit quicker. I don't see a setting I've left on that could possibly affect it and usage isn't equal to standby (something I know plagued some users in beta 1).