Take a look at this link to a Peyton Manning t-shirt jersey. The font for the player last name is different than the one that has been used since 1997. Additionally, the style of font for the number is different, too.
Tuesday's Nike/NFL press conference should be interesting. Apparently, the press conference will announce changes in some shape or form to all 32 NFL uniforms--whether that means wholesale changes or just a fabric and Nike swoosh alteration remains to be seen.