Also, I too am curious about a new version number I think I recall toady mentioning like 4 major numbers, but not sure.
The numbers are the number of completed
core,
req, and
bloat dev items, followed by a letter indicating additional releases without major updates. The core count is preceded by a third digit, which will set the game at version 1 when it gets to 100 core items.
The current version, for example, is 0.
28.
181.
40d, indicating that it has 28, 181, and 40 core, req, and bloat dev items, respectively.
As for the number of the upcoming version, there are far too many reqs and bloats to sift through, but I found a good 4-8 Core items that seem to be finished; Toady may have additional plans for them in the future, though.
11 - Enemy Pets. Leaders having pets based on their preferences and surrounding region. There was a decent description in the devlog a while back.
36 - Burrows. We were all excited about this one. I seem to recall Toady mentioning there was more he wanted to do here, though.
72 - Robust Attributes. All sorts of new attributes now.
73 - Combat Overhaul. Hell yes.
74 - Wound Handling. Hell yes.
78 - Wilderness Population Tracking. I seem to recall a dev log update mentioning that all creatures spawned from a finite, but very large reservoir now (they do that now, too, but it's smaller in the current version). I can't remember if they'll breed offmap yet or not, though, which may be required to finish this one.
92 - Appearance Variables/Descriptions - Hell yes.
93 - Randomized Megabeasts and Powers - Dunno if he'll work on this one more.
There were also bits of #53 (More Raw Files) and #91 (Proper Underground/Map Features), but those seem like ongoing projects that will probably be among the last of the core items to be completed, especially the former.