Melanie Blower, an Intel employee, has announced herself to GCC and requested the FSF-approved legal paperwork that's needed for copyright assignment. As Melanie explains, "the FSF prefers that a contributor files a copyright assignment for large contributions." Beyond GCC she also looks to contribute to binutils, gdb, and glibc as an Intel employee. She also has two Intel colleagues that will be joining her in this open-source endeavor.
While the two other Intel engineers looking to contribute to GCC have not yet been acknowledged, Melanie Blower appears to have an extensive background in compilers and has written a few going back to the ADA programming language. As of six months ago, one of her web-pages explains she is "working on a C compiler for Intel network processors."
What will Intel be doing to GCC? Only time will tell, but considering the number of Intel technologies on the horizon, any large contribution(s) should be interesting and appreciated by the free software community.