New walls would be welcome, the magmas really don't fit in with the ancient gingerbread house theme IMHO, that and I loathe the look of magmas would have much preferred to keep the zaps.
As for heroes, maybe 5 levels increase? Like max 45 initially, and the buff them later as TH11 defence is buffed/nerfed in successive updates. If the new hero does have 40 levels (I heard it was way less, like 5 or 6) then I hope there aren't any immediate level increases to the BK & AQ.

