Bethesda on the 2nd of September trademarked the name Soulburst under the description of ''Computer game software for use with computers and video game consoles; downloadable computer game software offered via the internet and wireless devices; computer game software for use with on-line interactive games''.
This is the link to the trademark details http://tess2.uspto.gov/bin/showfield?f=doc&state=4804:q3w1x9.14.1