Here is what I would like:
1. Hot swappable internal hard drives
2. 10G Ethernet (Standard or optional)
3. Faster CPUs, Ram etc
4. USB 3.0 (~late 2008)
5. Firewire 3200 (~late 2008 - early 2009)
6. A SMALL lcd screen (2cm) either in the front or back displaying uptime, and errors with hardware (making it much easier to understand possible problems, and correct them as soon as possible)
7. Tooless Optical drive accessibility
8. ESATA ports
9. Anti-vibrational rubber pads at the base of the tower, on the optical drive bays, and on the hard drive bays. This will improve the reliability of the machine, and will make it much quieter.
10. Some sort of hard drive cooling. A heatpipe system would be great! The Mac Pros currently have problems with hard drives overheating (slightly). If there were copper heatpipes on the hard drive rails (something simple), that would improve the reliability and longevity of the system even more.
What do you guys think?