Brock Lesnar possibly returning to UFC appear to just be a publicity stunt to drum up hype for his upcoming WWE return, which will happen on tonight's live RAW from Richmond.
Their sources within WWE note that WWE has had plans for Lesnar to return on the December 30th RAW for some time. A WWE spokesperson told the site:
"WWE has exclusive rights to services (to Lesnar) and such exclusivity extends to ultimate fighting competitions."
Lesnar's WWE contract will not expire until April 2015.