Seeing how 2.0 has R2, R3, R4, and R5 showing up in the Wave 1 and the core I have to wonder if we won't end up seeing new lines showing up in Wave 2. Specifically the R6, and BB astromechs. As a side note I hope that when the E-Wing is rereleased we see R7s added back.
Using 1.0 as an example I guess they could give BB astromechs BB-8's ability and then make it so that BB-8 gave the option of a free Barrel roll or boost. Though, if they wanted to limit the overall use of it they could always make it charge based and just give BB-8 an additional charge to use just how the R2 Astromech and R2-D2 work in 2.0.
Of course the idea of adding BB astromechs brings up the question of if they would keep it as a generic option open to all factions that can use Astro upgrades or if they end up making it so that it was Resistance Only to represent they were a newer droid. Then again if they wanted to end up having it where each Astrodroid capable faction had a generic droid unique to them I guess it wouldn't be too bad: Rebels - R7, Resistance - BB, Scum - R1 or Lothal Astromech, and Republic (if they were added) - C1 series Astromech (since Chopper was used during the Clone Wars).