The "Mechanical Counterpressure" (or SAS) space suit is the holy grail when it comes to mobility, flexibility, and being lightweight however it also has it's share of problems. It's very difficult to tailor, difficult to get into, and has problems conforming to complex human geometry.
3D scanners and automated software can easily generate templates for suits sparing expensive and time consuming manual tailoring
New "smart fibers" may be able to expand and contract on command making it easy to get into and tighten electronically.
However, solving the "complex geometry" problem is a bit more difficult. In NASA's original SAS trials, they solved this by padding concave sections of the body (such as the back and armpits) with foam and more recent attempts at a MC suit such as MIT's Bio-Suit also struggled with complex joints such as the hands. It then mentions that to solve this problem, they used a separate pressurized gloves and pressurized helmet.
How is the transition from mechanical counterpressure suit to gas-pressurized suit in the case of helmets and gloves accomplished without leaking air?
See helmet to suit transition