6 new bass amps (14 channels total, including 5 for the 50th Anniversary SVT alone), sidechain for Dynamics blocks, much more flexible 7-band Parametric EQ with adjustable high/low cut slopes, and don't sleep on the Split > Crossover block, which has been there since Helix's launch in 2015. Stadium 1.1 will have 16 bass presets with info and dry clips; I actually like them even better than the guitar presets—Dom and Brad killed it. They still suck tho' of course, because All. Presets. Suck.© More sucky factory presets to come in future updates.
No new bass-centric effects just yet, but I'm sure they're coming.