could you please tell me when the 10.3 patch will be done and ready to update my fm 10
SI never give a date. It'll be ready when its finished, which clearly isn't going to be at least until the transfer window is closed. They don't give a date so as not to disappoint people if things go pear shaped and they have to delay it. Patience is a virtue.
Which aspects of the game will be changed with 10.3? Is there a statement of SI?
The very best you'll get is a "we are aware of the issue and are monitoring it for the patch" or something similar. I'm afraid it's just a case of wait and see what is on the fixlist that is released at the same time as the patch.
Last year it was a few days into March, if memory serves. But SI won't tell you because they don't know. If they think it'll be ready by 28th Feb and say so, but on the 27th they find a big problem they'll have to delay it a few more days.