Beamer supports LuaLaTeX and XeLaTeX, but it's not documented
Since Beamer was mostly developed in time before LuaLaTeX existed and before XeLaTeX was a popular choice (and likely before it was included in TeX Live), Till didn't consider necessary to discuss Beamer's compatibility with both. But now, instead of two (latex+dvips+ps2pdf and pdflatex), we have four engines.
However, they both work and that should be documented. TikZ/PGF manual is better in this regard, even it doesn't mention LuaLaTeX for same reasons.