I've analyzed all the leftover Clan mechs that fit the current timeline, and here is my subsequent prediction on when/what we will see.
First off, I predict we won't be seeing any non-omni Clan mech chassis for quite a while (yea, unfortunately this means no Kodiak, Conjurer, Stone Rhino & any of the TOTALLY AWESOME IIC mechs). I made this prediction based off two points.
The first point is that PGI's current trend is to only release a mech if there are three or more variants available in the timeline, and that would currently be the Clan Invasion (3050 - 3052). That makes all but six mechs invalid: Bowman, Incubus, Jenner IIC, Locust IIC, Trebuchet IIC, and Wolfhound IIC. There are four IIC mechs available in the timeline, but this leads to my second point, that PGI releases mechs in 4-paks containing one mech of each weight class. So three lights and one medium don't really fit into a 4-pak. We could possibly see these six mechs released as individuals, but seeing as six battlemechs won't make much of a splash compared to the 17 or so omnimechs available, it's safe to say that Clantech will be omni-exclusive for the foreseeable future.
Having taken care of that, here are the omnimech choices left:
20ton Fire Moth
25ton Fire Falcon (3052)
40ton Battle Cobra, Viper, Pouncer, Coyotl (outdated), Phantom (3052)
45ton Mongrel (3053)
50ton Huntsman
55ton Stooping Hawk, Black Lanner (3052)
60ton Lupus (outdated)
65ton Crossbow, Linebacker (3052)
75ton Woodsman (outdated), Night Gyr (3052)
80ton Naga (requires development of Arrow IV)
90ton Kingfisher
95ton Turkina (3052)
Taking into account these mech choices, their tonnage, weapons loadout, number of variants, popularity and whether or not they're outdated predecessors to existing mechs (ex. Timber Wolf is based off of the Woodsman, which only has Prime and A variants anyways), there is enough here to make two mech packs:
CLAN WAVE 4 MECH PAK:20ton Fire Moth
40ton Viper
65ton Crossbow
90ton Kingfisher
(possible bonus) 50ton Huntsman
CLAN TUKAYYID UPDATE 3052:25ton Fire Falcon
55ton Black Lanner
75ton Night Gyr
95ton Turkina
(possible bonus) 40ton Phantom
The remaining mechs (and unused bonus mechs) could be introduced individually, like some of the IS chassis were:
40ton Battle Cobra
55ton Stooping Hawk
80ton Naga (would require a joint IS/Clan release of Arrow IV missile system)
45ton Mongrel (3053: technically does not fit timeline but might come soon after)
40ton Pouncer and 65ton Linebacker (both make good alternate choices as bonus mechs for either of the mech packs above, or could be released together in a sub-pack, since they're rather similar in design and philosophy)
Mechs that won't make the list (probably):
40ton Coyotl: The original test-bed for omnitech, henceforth EXTREMELY important. Sadly, it only had a Prime and A variant, so we won't see this mech unless PGI decides to go MAX apocryphal.
60ton Lupus: This mech is the predecessor of the Mad Dog, and subsequently very similar. It even has the same tonnage, so including it might be rather redundant. However, there are three variants available. Still, very low chance of seeing this mech.
75ton Woodsman: This mech is the predecessor of the Timber Wolf but unlike the Lupus only has two variants. (excluding UK Frankenstein variants, which don't even have the same tonnage... dafu-)
That completes the list of near-future Clan mech contenders. Feel free to share your thoughts on whether you believe my mechpak choices are good or bad, your favourite mechs / mechpaks, or any other mechs that I may have excluded from the list.