Was just thinking this myself T Marsland it also includes digital copy. Like the US import version available on amazon UK it has 8 discs on the Disney site. If amazon or play doesn't clarify the situation may be forced to cancel my pre order with amazon.
Usually they will be branded Blu-Ray 3D on the front cover, this one isn't so it's quite likely that it won't have the 3D options, you would most likely need to get the 3D Lion King Blu-Ray instead here: The Lion King (Blu-ray 3D + Blu-ray) [Region Free]
As far as I know they only made the first film in 3D, hence the trilogy box set not being sold with 3D option...
(For reference, the regular Blu-Ray is listed here: http://www.amazon.co.uk/Lion-King-Double-Play-Blu-ray/dp/B003ARSXKE/ref=sr_1_2?s=dvd&ie=UTF8&qid=1320503137&sr=1-2)