Z10, 4G LTE and frequencies

Hello,

Do we know what frequencies the 4G module of the Z10 will be able to use ?
For example, I live in the UK and we have one provider offering 4G on 1800MHz (ex 2G frequencies) and another one going on 800 or 900MHz frequencies.

Does it means that we will have different versions of Z10 and so "stuck" to one provider ? I wish not.

If anyone has the information, just let us know ! :)