There's quite a few, actually: Kelsey, Tsujatha, Angelo, Xan (elf only), Solaufein (bi-), Faren (also bi-), Kivan, Darian, Arath (SoA only but ToB is coming soon) that I can think of off the top of my head, plus romances for existing Biowares, Sarevok (ToB only), Haer'Dalis (currently SoA only but ToB is in the works) and Edwin. A Keldorn romance is also in development at beta stage. But of course not all of those are to everyone's tastes so more options are always better!
I am glad to see mods like this still in development - I can play through BG2 any amount of times if I have a new (and quality) mod to play with and Aklon seems to fit this description.
Out of interest, is he being released SoA only at first, or all in one go with the ToB portion as well?