Great news for Ottawa! That is a big plane though...add that to the fact that AC is going from 763 to 788 on YOW-LHR, I hope YOW can absorb the capacity!
On another related note, with all the recent LH and M&M action at YUL, is there any chance LH would consider opening its own lounge in YUL? Next summer, they'll be flying daily, or almost daily, on their own metal, from YUL to:
FRA
MUC
VIE
ZRH
BRU