I will Move your post to the Premiere Elements Forum.
Your link and any e-mail subscriptions will follow.
As for your answer - Yes, provided that it is RGB and 8-bit. However, if it is a PSD with Layers, it will be Flattened. PrPro can Import Layered PSD's, as a Sequence, and keep the Layers separate.
[Moved to Premiere Elements Forum]
Please go the free tryout route for Premiere Elements 12 before any purchase.
But, I would ask Hunt for clarification on his reply. If your plan is to transfer edited video from Photoshop CS6 to Premiere Elements 12, what good is a flattened PSD file representing your video in Premiere Elements 12?
But, from what I understand of Photoshop CS6, after you do your video editing there, you export your edited video as H.264 (not sure of file extension) or QuickTime video. No PSD file flattened or otherwise.
Ps CS 6 (and the Extended version back to CS 4) can edit Video (limited Import capabilities, and limited Export capabilities). However, Ps will NOT Export any Video as a PSD. The PSD format is the Ps native Image format, and is output via Save.
My *assumption* was that the PSD was a Still Image, that was perhaps going to be animated in Video via Keyframing the Fixed Effects, such as Motion>Position, over time, as there is no PSD Video. Perhaps my assumption was incorrect, as to what the OP has, and wishes.
In Ps CS 6, Video output will be to a standard Video format/CODEC, but the list of available formats/CODEC's is very limited, compared to Premiere.
Maybe I am just misunderstanding what the OP is looking to do?
What made me wonder about the question and the reply was the start off description/question
I purchase Premiere Elements 12, will I be able to open PSD video files from photoshop in the Premiere Elements?
You could be correct, and maybe I tried to "fill in too many blanks."
Also, there were two very similar posts, with slightly different wording, but the general question seemed to be the same.