gr-dvbs2 has been updated to include all of the normal frame size code rates, roll-off factors and constellations in the DVB-S2 extension specification, DVB-S2X. Note that gr-dvbs2 is transmit only.
https://github.com/drmpeg/gr-dvbs2 https://www.dvb.org/resources/public/standards/a83-2_dvb-s2x_den302307-2.pdf Since the specification was just released in March 2014, there are no consumer of prosumer receivers available yet. Therefore, the new DVB-S2X modes are not fully tested. However, there are only minor software changes required, so confidence is high that the new modes will work properly. Regular DVB-S2 modes have been retested to ensure there are no regression problems. Here's what one of the 256APSK constellations looks like in GRC. 256APSK Ron
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