The plan has not changed and the roadmap is for now still valid.
Support for v1.19.2 will be dropped today.
v1.23.5 will become deprecated as soon as I am satisfied with v1.25.0 (and it's getting very close, with today's release).
The time saved by dropping support for v1.23.5 will be used to either port mesh support to v1.25, or to start and develop a v2 branch of the Cool VL Viewer, whichever will be easier to do.
This shall prove an easy backport, *much* easier than what I already did with Alpha and Tattoo support, inventory item links support, and multiple-attachments support...
Mesh support will indeed be what will decide whether a move to the v2 code base is required or not. But it might prove easier to backport it to v1.25 than to redo the whole UI in v2 to match the Cool VL Viewer v1.25 look and feel... In the latter case, the move to the v2 code base will only be partial, i.e., I'll progressively move everything not UI-related to the v2 code, but will keep all the UI code (llui library, all llfloater* and llpanel* files, etc) "as is", which should make keeping up with the future v2 versions easier (at this point however, I would have to right out fork the v1.25 code base and will not anymore provide individual patches for each new feature, since the changes to the code would become too deep to produce mutually compatible and independent patches).