http://www.bbc.co.uk/news/world-europe-36120560
I think the whole issue of TTIP is probably more important than whether we stay in the EU or not. It is tied up with that debate, but I'd be interested to know whether our leaving the EU would remove us from its embrace.
Well Obama has been talking about the prospects of the US/UK deal in terms of time (back of the queue etc) but presumably the content would be pretty similar to the TTIP, although of course the UK would have far, far less influence in negotiations than the EU has so it would likely be more favourable to the US and less favourable to the UK than TTIP.
But the whole issue over TTIP highlights a couple of other points.
First time to get negotiations sorted and ratified. The TTIP negotiations have been ongoing for 5 years already and we haven't actually need approved by anyone yet. It still needs ratification from 29 countries - the USA and the EU 28, and requires all 29 to agree, if just one doesn't it is back to the drawing board. That gives a clear indication of the likely timescale for any USA/UK deal (which Obama indicated yesterday as 5-10 years) and for any EU/UK deal.
The second point is over ratification. The link in Hope's post shows the controversy and opposition in certain places. If this is sufficient to persuade just one EU country to fail to ratify then the TTIP is dead in its current form. There will of course be similar controversy (although perhaps on different aspects, probably free movement of labour) about any UK/EU deal and it is quite possible that after perhaps 6 years of negotiations one or more country in the EU will find aspects of the deal unacceptable and will refuse to ratify. And remember our period of grace on trade (no tariffs) lasts for just 2 years from the point when we announce we are leaving, so after that 2 year period the tariffs automatically come in force.