Will the difficulty level get harder for sure by tomorrow? If so, how can you calculate when will the difficulty will change and how much will the new difficulty will be?

I'm still new to this so please bear with me.

up at top, give estimated diff, how many blocks until it changes and also how many blocks per hour so you can sorda get rough idea

http://bitcoincharts.com/markets/Estimated 560419 in 74 blks

Blocks/hour 12.59

74/12.59= roughly 6 hours till increase