Did you even read the release... They can option the 200's for 700's.....
unless one of the contract carriers in the US Air system (Rep, Mesa, PSA operate the 70 seaters CRJ700/900 and ERJ170/175) sheds some 70 seaters they cannot add any more 70 seaters WRT our scope.
The limit is 110 (ish) and they are at that now.
Fr8tmastr could probably give some better details.