"At present, the only publisher to confirm costs of their next generation games are EA, attaching a price of £54.99. No other game prices have been confirmed."
Both Call of Duty: Black Ops and the previous Modern Warfare 2 initially retailed at £55 and sales were pretty decent for both, so EA obviously sees a market opportunity in taking all of its next-gen titles to the higher price point.
As Game points out, EA is the first third party publisher to announce its pricing plans for the new consoles, but whether others will follow suit remains to be seen.
It's also worth remembering that shops won't necessarily stick to the given RRP, as witnessed with Black Ops, which several retailers offered for a lower price tag from the off.