DOCSIS 4.0 is probably still a long way but some of it depends on where you live. No doubt some areas will get the upgrade faster then others. Already some parts of OK, CA and CT have the 2 downstream OFDM channels and 1 upstream OFDM channel, making full use of the D3.1 hardware finally. Once your area has been upgraded and implemented you should start seeing upload speeds up to 100Mbps with lower packages getting the upload speed boost soon after. 1000/100Mbps, 500/50Mbps, 100/10Mbps and so on. See my thread "Upstream OFDM is coming" for more info including links to the DSLReports threads.