Well we've been through our first week of the Cataclysm and many of us have been quite busy with our professions. Blizzard has been quite busy too with a slew of hotfixes coming out every day or two. I'm actaully a bit disappointed because many of these items were reported in the Beta.
There are times when I think the secretive nature of Blizzard's communication with us is actually detrimental. Transmute: Living Elements is an excellent example of this. Who knew that you could do the transmute in specific locations to control the results? This would have been very useful to know in the Beta - I could have tested this and made sure it was working. Elune knows I was using it often enough! However, because that tidbit was not shared with the community, the recipe went out buggy. The hotfix post also claims that this recipe is affected by transmute procs, but I never saw evidence of such in Beta. Had I known it was supposed to proc, I would have reported my lack of them. I think I did submit a comment on it, but I would have tested that more rigorously than I did.
They also fixed the infamous Lavascale Minestrone recipe. I know we debated the crazy skill points quite a bit here. Clearly it was "not intended", which we knew. Luckily this recipe didn't end up being as pivotal to Realm First cooking, since the daily quest went live before the cap was raised. I still find it interesting how many profession-related problems were corrected post-launch, as opposed to being dealt with pre-launch.
There were also a number of random epic recipes that seemed out of sync with the materials required. The missing cocoa beans have been added to the token vendor in SW/Org. Enchanters should be able to get more dust from disenchanting armor. The new Runescroll recipe for Scribes wasn't giving skill points - I know they didn't appreciate that!
Kaliope actually looted two different Jewelcrafting recipes last week, but they were BoP and she couldn't use them. It looks like the BoP recipes have been changed to BoE, I've been seeing these on the AH the last few days. The prices are a bit steep to my mind, I'd be tempted to wait a couple of weeks and see if they drop to a more reasonable level.
At this stage I'm finding the green gems to be of limited utility. There's not a lot of leveling gear with sockets, so the demand for Cata gems seems lower. I'm sure this will change as more people start raiding. Right now the ability to cut blue gems is being throttled by the daily quest, so blue gems will take a while to trickle into the marketplace. I think all these green gems will end up serving as placeholders for the blue versions during this transition period. Meanwhile I encourage all you jewelcrafters out there to be strategic about the recipes you buy! This could have a huge impact on your profits if you end up with the same blue cuts everyone else is getting.
Mining is still a challenge for most people. I think we expected obsidium to be a problem, but elementium can also be hard to collect if you're farming during peak hours. I'm even having issues during my normal off-peak hours, which I suspect is some form of spill-over effect. I would expect this situation to continue for a while because phasing is interfering with normal farming routines.
These are just some of my observations from the last week, feel free to contribute your own in the Comments :)