I now support TCOD's image tools (using gdx Pixmap) including scaled and rotated blits. Alpha is used instead of key colors for normal blits; subpixel blits don't do alpha because they're too much of a hack. I'm not sure how useful it all is, given how easy it is to draw a real image anywhere, but it made the noise demo a lot smoother looking anyway.
I started working on FOV support, then decided I really hated TCOD's implementations, so I'm adapting the algorithms from the awesome SquidLib
instead. Stuff like LOS and FOVare making a pretty extreme departure from TCOD as it is, so I suspect I'll be ditching TCOD API compatibility everywhere else sooner rather than later.
Still TODO: Finish FOV and LOS, then start on pathfinding and BSP. At that point I'm pretty much feature-complete as TCOD functionality goes.