Yes, but only on the EE network and not on the frequencies that O2 and Vodafone will be using.
Personally I'm waiting for '3' to release their 4G/LTE plans: they're typically far better for price and provide genuinely unlimited data tariffs unlike the other providers.
Seems like 3's plans are going to be the same (if not similar) to what they offer now. They've said that customers will be upgraded to 4G at no extra cost and I presume they'll keep their all-you-can-eat data tariffs, which is the best thing about them.