On the Quartus II device selection screen, some devices are labeled as Advanced or Initial. What does that mean?

Devices marked Advanced indicate devices that will be supported in a near future version.
It can compile, simulate, perform timing analysis, and generate device pin-out information, but no programming files.

Devices marked Initial indicate devices that will be supported in future versions.
Compile, simulate, and perform timing analysis, but no device pin-out information or programming files are generated.

Devices with advanced support and initial support for each version are listed in the device support release notes.
・ https://www.altera.com/en_US/pdfs/literature/rn/rn_qts_dev_support.pdf (latest)
・ http://www.altera.com/literature/archives/lit-archive-index.jsp?doctype=Release%20Notes&prodCat=Quartus%20II%20Software (old version)