For WoG (In the Wake of the Gods), an add-on being produced by a group of contributing fans, there haven't been any major updates in a while. Despite various rumors about the possible disbanding of the group, which even I was curious about, Corwin, a member of the New Town group, states otherwise:

"Regarding rumors that we are no longer in business, we state this is JUST RUMORS, and we are very much “alive”!"

While I was on the New Town page, I discovered some updates worth seeing. Several new creatures have been added to the Bastion creature list, some just pictures, others full animations. New creatures include the Saint Scarab, Overseer, and Anubis Warrior. To view extra useful information about some of the creatures, click the 'More' button. Take a look!

Also in the News section, stated by Corwin, is an extremely intriguing idea:

"Probably everyone who played "Heroes 3" even once, dreamed to have a possibility to see his built up town from different angels (bird's eye view for example).
And now, You CAN DO THAT! Thanks to Supkrovi who makes internal graphics of town. We proudly present to You the new town reality!"

I am unsure whether this feature has been released with a recent version of WoG, but if not, we can definitely expect some neat updates in the future!

On the WoG page that Celestial Heavens has a link to, I found comments that said new neutral monsters were introduced in current WoG. I had seen some of them, and heard of others, but never actually found a list of them. After a bit of searching, I found an excellent page here. The list includes all stats, costs, special abilities, and even each unit's dwelling.
While you are there, check out the Commanders. For those new to WoG, commanders are hero-like units that can level up and fight on the battlefield with other units. This list has full stats and unique special skills. Enjoy these impressive reads!