The jerseys can be kept the same,it's just a change of logo.
The logo they use now is the most "maple leaf" like logo they had,but it's actually not entirely like a maple leaf.The 2 examples below,are much more closer to an actual maple leaf. One on the left is maple leaf from Canadian flag. One on right is maple leaf the Jays use. It's not too much of a change from their current, but looks more "modern"(at least to me),and it's enough of a change to lead to all new merchandise from them. Not like a color change or something like that,it's a tweaked logo,which you know many fans will go out and buy new gear,just cause it looks slightly different.