This is work in progress, as far as I understand, the only binding rule for the moment is that the charger needs to have a USB plug, which Apple respects (and I'm not even sure about this is binding yet). The plug towards the phone is not regulated at all.
Just google to get more information, eg.:
http://www.macobserver.com/tmo/article/proposed-eu-law-could-force-apple-to-change-iphone-charging-connector
http://news.cnet.com/8301-13579_3-57604904-37/eu-wants-all-companies-ahem-apple-to-use-standard-charger/
My opinion? They won't standardise anything for years. USB 3 plugs are soon going to be there (Micro-USB plug outdated soon). Apple will continue to use their own port.
Ultimately, I think they'll just enforce the situation as it is: regulate the power charger specs (as it is now, with a standard USB port), and leave the cable and phone port for the manufacturer to decide. Their ultimate goal is to allow and encourage manufacturers to NOT include the power adapter with the phones/other small devices, since the customers could reuse the ones they have.
This will be good for the environment, annoying for some customers...and a good deal for the manufacturers.