It could be true. I'm not accepting it as a fact, but it certainly makes a lot of sense. It's typical Blizzard, and it's not like we haven't seen paladins and paladin-like classes before. A lot of people are thinking paladins will become the next D3 class, so it actually all fitis into place. It also makes you wonder why they'd choose exactly those names, what with how a BL-expac is pretty much near-confirmed; if it's not next expac, it's the one after that.
Not holding my breath, but it would make sense.