I think the next AC from Bachmann would be the 84 to close the gap of RTR AC electric locos these days, especially after the 85's success. But who knows, only Bachmann does.
The thing is, is that Hornby hasn't updated the 86 for some time, nor the 87 or 90 or the 91+DVT with bi-directional lights, windscreen wipers, etc etc. And that is why I can possibly see Bachmann for next year releasing another AC loco to the same standards as the 85 and 350.
And talking about the 84, hopefully Bachmann would release in general production, the 84 in RTC (i think) livery of red/blue engineers colours.