No it won't. If you've "contracted out" for a long time like I have you will see an effective reduction from £155 to £115. That's how it stands at the moment, don't rule out further fidling.
I've been looking at mine this week. I'm 52 and planning to retire in 5 years with a reasonable lump sum and around £1600 a month pension. I've recently started putting AVCs (Additional Voluntary Contributions) in too, to boost it a bit. As far as I can tell, I qualify for a full state pension...