It does excite the imagination, but lack of cometary out-gassing and a red color are IMHO not possible clues that this may be a spaceship. Deep space objects seem to get coated with a red-colored goo that is composed of a class of compounds called tholins. And there is no reason a priori that an object flying past us on a hyperbolic trajectory through the solar system should out-gas.

It's a fairly small object with a low albedo. Amazing that they even saw it last October.

__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President