Hi Ashley and Martin,
Just want to be clear here: Ashley is asking about the TBM Taxonomy I believe, not the Apptio TBM Unified Model.
The TBM Taxonomy is maintained by the Standards Committee and we anticipate annual updates, although there may be minor updates in between. Specifically, we now have a subcommittee focused on TBM Taxonomy Evolution, which is chaired by Michel Brassart of HPE (soon DXC Technology, the spin-off from HPE and CSC). The subcommittee is working toward the next version now, hoping for a release later this year. Whether or not that will be v3.0 is yet to be determined, as is its release date. When it is released, it will be ratified by the TBM Council's board of directors as well.
Apptio incorporates changes made by the Council pursuant to its product release plan. Since EHayman@apptio.com">Ed Hayman from Apptio sits on the subcommittee, he is fully apprised of all work being done.
Hope this helps.
Todd