Obviously, the 1.5Mbps upload speed won't be consistent everywhere, as reception varies (significantly, with Sprint). Also notable is that if you're using a "fixed device" (i.e. a Motorola 4G desktop modem), you won't be affected; the 1.0Mbps speed cap is on your device to stay.
Nevertheless, we're sure EVO and Epic 4G users will be happy to hear about these changes - faster upload speeds are always good news, even if competitors don't even have such caps.
Thanks, Captain Anonymous!