I am currently waiting for the deluxe 3.5 hardback version, which should be out soon. I imagine that is taking up most of EN Publishing's time at the moment.
After that (assuming it doesn't bankrupt them!) they can move onto 4th edition.
It'll be interesting to see how it looks. The last fight we had was against :-
[sblock]35 4th level fighters,
3 8th level fighters
3 11th level fighters
3 7th level clerics
1 12th level cleric
2 wyverns (with riders)
and a fiendish war mammoth[/sblock]
That took the best part of two sessions under 3.5, especially since the "minions" had 35 hit points each. I think 4th edition might have been a better fit for that particular encounter