This is only a sample size of one, but I solo'ed a planetary CZ up to the Hydra stage tonight as easily as before U15. Scouts are back to normal damage and behavior. they just don't camp at the station anymore. I had no Glaives turn up, so that might have spiced it up a bit, but I could very much ignore or choose to fight the Scouts the same way I could before U15. Zero difference.
As for the pulse warning, that was only the very first one for me. All others triggered the correct warning. The lack of heart glowing is unfortunate though; I was fighting with an enhanced scanner, so I could mark the heart as soon as it was exerted - for a brief period, there is a white glow on it that then gives way to the red glow, only the red glow does not happen. But I can see how that is an issue.
Having said that, seems 15.01 fixed the Scout issue completely. The Glaives are another thing though; I love them. Nasty little things. I played around with Glaive interdictions a bit in my shieldless AX Krait with a pair of MCs and Gauss cannons. The Gauss are dead pretty quickly, but I had no real issue killing a single Glaive with the two MCs. The biggest issue is the large amount of caustic damage they do via the barrage of missiles they launch.