There are two regular production Luke's, the "normal" Luke with vintage trem, and the maple topped, mahogany toneblocked BFR Luke.
From time to time there are limited editions like the upcoming roasted maple / Black Sugar finish instruments. In the past there have been a variety of limited editions with special options (eg. all rosewood necks) or special colours (eg Dargie green, Blue Dawn, Buttercream etc) but these normally apply to most EBMM models, not just Lukes.
OMG I just played a BFR Luke at GC in Bakersfield, CA. It is a metallic reddish color. What a sweet guitar. I almost threw down my GC credit card!! I had to exert extreme willpower.
So the BFR is all that compared to the Signature?[/QUOTE
I think it felt a lot like my signature but the color was awesome and the neck wood was cool. I do however like the maple neck on the signature. I honestly think that either guitar is great.