http://64.49.204.5/category_s/3.htm It looks like the 4'6" is rather skim style'ish. That LOA is a pretty common size for most of the skim style boards available.
With Walker in the mix, that will be Inland's 4-skim, Calibrated, Phase 5, Walzer and now a Walker Project.
As I've said before it looks to be a good summer for skim style riders.