Ars Tactica looks like a game following in the many Tactics titles (Final Fantasy, Ragnarok, etc) that found a home on the PSP. Bringing things up to date, Ars Tactica, offers turn-based strategy and combat set around an isometric 3D grid.
The title is being developed by Alpaca games and has a Twitter account and Facebook page offering up pics and more info. It is coming to PC and Vita, thanks to Unity, sometime soon we'd like to hope.
Thanks to Vagabond for the hint.