I talked to MonkeyGod at Origins and they told me then that
Frost & Fur was their last release. Financially, it didn't make sense to spend four times the effort and money to produce a roleplaying game that only sold a few hundred copies at best when they could make board games under their other name, Face 2 Face Games, at a fraction of the cost and have sales that numbered in the thousands. They also confirmed it again to me at Gen Con when they said
Arms & Armor v3.5 would be the only 3.5 collection of weapons and armor because they were not going to do a 3.5 version of
From Stone to Steel.
Of course, MonkeyGod isn't the only company no longer producing d20 materials. To my knowledge, Atlas only has one or two products in development and they are done with d20 supplements for the time being. AEG has no plans to do anymore one-word titles, instead doing Spycraft driven and Warlords d20 lines. Fast Foward is done completely. Living Imagination is done and is going back to focusing on their LARP business. Rumor
(and I stress that word) has it that Fantasy Flight is done with their
Legends & Lairs line for the forseeable future. There are also a couple of other companies on the bubble who I expect to call it quits in the near future.
As far as an official notice, don't hold your breath. I doubt any company will make a public announcement saying they are giving up. No one wants to admit defeat and many will probably try to get back in the game if things pick up again.