Texas Instruments for one, have released a new family(it might be a single IC or more, can't recall) that are using the "no capacitor needed" feature to promote them self s, however if you read the actual datasheet they are very clear with the fact that it might work very well without decoupling caps but they are most often still recommended.
Even if I where facing some unusual situation with very stable circuits without much noise I would never count upon the fact that the regulator may work without the capacitors, I don't think anyone here can say without actually testing a prototype whether that would work or not.