MacEdition posted a small blurb reporting that security has been heightened at a recently reclaimed Apple location (Mariani One), which became occupied by Sun in 1996.
According to MacEdition, the heightened security is to protect Apple's latest efforts:
These efforts include future iPod revs, to be sure, but Apples own Area 51 is apparently the proving ground for at least one major new portable device designed to bring postmodern multimedia goodness to the masses.