Blizzard have announced that the MoP Digital Deluxe Edition is retiring very soon, which will remove one source of the Imperial Quilen mount and beaten-with-a-Pandaren-ugly-stick Lucky Quilen Cub minipet.
You can still get these from Collector's Edition boxed sets, which don't seem horribly expensive on eBay yet, but it's worth noting anyway.
In the announcement, Blizzard did hint that the digital deluxe edition may not be gone for good, but didn't say any more than that. I'm wondering if their long-term strategy may be to release digital deluxe editions all the older xpacs and it'll be back then. That's pure speculation, of course







Sofia, the remarkably purple spirit cat as drawn by Ket Shi. 
☆ 