Hipsters today seem to be youngish (under 30)"kids" who enjoy throwing off the things that Gen x enjoyed along with the Boomers. Microbrews are a good example. Hipsters drink Pabst Blue Ribbon which they call PBR.
There seems to be a neo-working class attitude among hipsters.
And you are right, there are no young beatniks, but, then I remember some publication -- NYT, the Atlantic, Time: who can remember any more -- way back in the 60s writing about the difference between hippies and beatniks. The one difference I remember is that beatniks dressed in black while hippies loved color. Actually, there were no beatniks during the hippie era, which I consider long dead and buried.