"The studio continues to build a unique launch strategy for the film that involves limiting the availability of certain SKUs. Retail access to a single-disc standard-defintion version of Twilight will be restricted to rental stores and a very limited sell-through account base, which Summit has declined to detail."
"The studio declined to give the exact reason for curbing the initial availability of Twilight on Blu-ray. Nearly all major theatrical hits now launch widely on both standard-definition DVD and Blu-ray on the same date."
You can read the rest of the article here. Artificially limiting the availability of product SKUs is something that Nintendo has successfully done in the past to inflate demand for their products. While I completely understand why Summit is taking full-advantage of this lucrative opportunity to milk Twilight fans' insatiable appetite for all things Twilight, it's totally annoying and greedy. Just sayin'!