Trish Stratus did indeed suffer a concussion last night at WrestleMania, and was a legitimate injury after Mickie James kicked her in the head. James was very much distraught after finding the news out, and the WWE may or may not generate some sort of angle with this going along in the future with this feud that they have been running. While Stratus' injury is a concussion, and not normally something that would mean this long of an absence, the WWE is taking extra steps to ensure the health and well-being of their talent after the Guerrero incident last November. The plan was to have Mickie and Trish face one another at Backlash, but with Trish sidelined, the plan now will most likely be to hold off on it as Stratus is on this medical leave, and to pick up the program in the summer.
Watch out for some new talent to arrive on the scene on both Raw and SmackDown over the course of the next month. Ken Doane and Matt Striker may be making their appearances on the main roster on Monday Night Raw in the next few weeks, as early as tonight in Rosemont, while world-renowned competitor CM Punk and recently signed Monty Brown, known from TNA Wrestling fame, may also be appearing. Brown requested his release two months ago in February, frustrated with TNA in contract negotiatons on an extension coming up, and nearly two weeks after that, Brown was signed by World Wrestling Entertainment, if you recall. Brown underwent surgery last month as it is well known, and has made a much faster recovery than anticipated, so expect to see him arrive on SmackDown within the month of April.
(I know this didn't actually happen, but I hope that this still goes over well.