Couple of notes before getting too excited:
(i) The article says "Embraer confirmed a deal for 30
195-E2’s last month but did not disclose the buyer’s identity". E-195 is the largest version of the E series and requires
1,805 m / 5,922 ft for takeoff with the maximum load. Even for shorter range flights (less fuel loaded) it still requires
1305 m / 4281 ft. More data
here
(ii) The existing main runway is
1,216m / 3,998 ft . Note that this is
not including the required extension to comply with the new RESA requirements. More data
here
(iii) The Tripartite Agreement (1983) prohibits the use of "jets" regardless of their noise profile (other than emergencies).
(iv) The Tripartite Agreement (1983) prohibits the addition of runways or extension to runways. On the other hand, apparently PortsToronto is still trying its chance;
here
In the light of above, my guess (total speculation) is, if it is indeed the Porter Airlines buying these planes, they probably already agreed on a lucrative bail-out plan with the Liberal Government, which may include a condition to move all or some of their operations to the Pearson Airport.