Well, I don't think it's anything that's mentioned directly. But there are a few things we can infer.
1) A Spider in the Web--at least partial cyborgs with cybernetic implants--bleeding edge stuff. So bleeding edge, it doesn't even exist yet.
2) Crusade (I forget the episode, but the one with Dr. Franklin)--shows that Earth has the capability of examining nano-tech, although we don't seem to be able to do much with it beyond that.
3) Crusade (episode with Brian Johnson guesting)--don't the rogues have cybernetic implants?
4) AI--Artificial intelligence is cantankerous at best. The station's AI program had to be sidelined because it was Harlan Ellison and therefore too grumpy to get along with anyone for any length of time.
5) Computer--The computers on B5 showed a significant ability to do raw research. Limited, focused AI seems to work.
6) Organ Replacement--As shown by G'Kar's eye, organ replacement seems to be attainable. If we can match the complexity of the optic nerve, we can probaly handle certain organs and possibly even limbs with limited (if not widespread) success.
Speculation--Robotics on the line of cybernetic implants are probably out of reach for the next 10-15 years (after the show ends) due to the level of pain they cause the host and their complexity. Artificial Intelligence programs can probably handle minor issues, but more complex programs prove to be too "uppity" to be effective--most manufacturing is probably governed by AI, fact gathering as well. Autonomous robots are probably limited to basic tasks such as manufacturing and sanitation--anything where human intuition and reasoning aren't desired.