It already is a challenge, in hard mode, a creeper can get you to 2 hearts even with full diamond armor :P (1.3 update).
Plus, have you noticed that creepers start charging up a bit earlier than when they did in 1.2? They used to charge a block away from you, now it's around one and a half or something, not too sure.
All I know is, I'm dying cause of creepers more than I used to.
But really, 1.3 is a huge progress, at least now we find real beaches and not 5 sand blocks next to an ocean :P Seeds have improved a lot.
EDIT : yup, just tested it, creepers now charge up around one block and a half away from you.
Last edited by EJM; Aug 7, 2012 at 02:49 PM.