We will all jump to conclusions and presume that there is a big barrier at 1.5600 in the cable but I have absolutely no confirmation of this. What I can say for sure is that some of the big Middle East Sovereign names were buying in size near 1.5600 during the London trading session.
Short-term stop-loss buy orders are also noted above 1.5670 but offers are reported behind there starting at 1.5695 (probably from the same guys who were buying last night!)