Let's start with the easy stuff first. Minecraft will be coming to PlayStation 4 and Xbox One starting this August. Those currently playing the Xbox 360 Edition or PlayStation 3 Edition of Minecraft will be able to upgrade for a low price ($4.99) and transfer their save files so long as they stay platform agnostic (Xbox 360 to Xbox One, PlayStation 3 to PlayStation 4. Cross-platform play, however, will unfortunately not be possible. Those buying for the first time cant drop $19.99 and not worry about any of the extra details.
Both the Xbox One Edition and PlayStation 4 Edition of Minecraft will feature "significantly larger worlds" and "greater draw distance" than their predecessors, but that does not necessarily mean to the two platforms will be the same. Specific differences likely won't be made available prior to launch. Also, in terms of what patch each game will release on, they'll both have same content available as their earlier generation console brethren. PlayStation 4 will have all the PlayStation 3 content; Xbox One will have all the Xbox 360 content.
Wait, there's more, and here's where things get really complicated! Also arriving in August will be the PlayStation 3 + Vita Edition of Minecraft. It's the Vita's first version of Minecraft, but it's being tied into a cross-buy title that will become the PlayStation 3's new de facto Minecraft bundle from then on. Here's the complicated bit. Minecraft PlayStation 3 + Vita Edition buyers will not have have the same discounted upgrade to PlayStation 4 available. That means those wanting to play both on PlayStation 3 and PlayStation 4 at a discount better buy in before August. All PlayStation 3 versions of Minecraft will have access to the Vita version post-August. Does that make sense?
Ignoring all the detail related to cost and expense, the important things are still simple -- Minecraft is coming to PlayStation 4, Xbox One and Vita in August. Those upgrading to the new consoles can bring their saves and skins (mostly) with them. Those few facts are all that really matters, don't you think?