"The 10- year anniversary celebration will begin in-game on Friday, November 21 and will last until Tuesday, January 6, 2015 at 10 a.m. PST."This gives us about 1 month and 2 weeks to collect all of the 10th anniversary pets. Hopefully that's more than enough time for everyone in the community.
The first pet, Molten Corgi, only requires a log in on any character during the 10th anniversary celebration. If you don't have too much time to spend in game, at least log your toon in and retrieve your adorable fire pup from your mailbox. :)
The second pet will require a bit more time (depending on your luck and the drop rate). Hatespark the Tiny is a drop from the last boss (Ragnaros) of a revamped 40 man LFR-styled Molten Core. According to developer Jeremy Feasel, it sounds as if the pet is not a 100% drop rate, and we'll need to kill Ragnaros multiple times before obtaining Hatespark.
"Repeat MC runners will have a chance to get Hatespark the Tiny and the Flames of Ragnaros enchant illusion :)"Personally, I'm not that thrilled. I'm hoping that since I'll need to repeatedly kill Rag, that the LFR version of MC will be split into wings. If it is, then I can queue for the last wing many times without having to go through the hassle of clearing the entire thing over and over again.
I wouldn't have such a big problem with MC if I could put my own group together and run it with people that I know and trust to not be dead weight in a raid. But I've yet to come across a solid LFR group made up of nearly all random people, that's performed well. Add to this uncoordinated and unorganized set of people a lengthy raid that's been revamped to match our current level, and ouch. Plus the RNG droprate of the pet and limited availability. It might be a painful experience rather than an enjoyable celebration of 10 years of WoW. We'll see.
Both pets will only be available during the aforementioned dates. That is, once the 10th anniversary celebration is over, the pets will not be obtainable anymore. Only Hatespark, who is cageable, might occasionally be on the Auction House post-anniversary. So remember to log in to at least collect your Molten Corgi!
Edit: I completely forgot to mention another detail that shouldn't be overlooked; you need to be level capped to participate in the LFR version of MC. WoD will be released November 13, so if you want to be able to participate in the "new" Molten Core immediately, you'll need to power level and be 100 in 8 days. That's a tall order for some players, especially for those that may want take multiple characters to the raid.
With this additional information, I'm not sure how I feel about the pet not being 100% drop rate. There will be a lot of pressure on collectors to reach the appropriate level and then overcome the RNG in a 40 man pug. All within about a month. Yikes.