I updated mine a couple days ago. I'm not sure what was added effectwise, however. I only use chorus, spectracomp and a couple different drives. I do see that some more complicated effects are still not able to be used (like viscous vibe).
The software update 3.1.149 should give you access to all of the Helix Phaser, Viscous Vibe, Octave Up and Combined Toneprints. Although I no longer own the BH250, it worked perfectly on the BH800. And according to the website, only the BG 250 115 MK1 will not take the new update.