Microsoft stated in their blog post that release candidate (RC) for Windows 7  Service Pack 1 is available for download.Dynamic memory and RemoteFX are only the new features included in SP1.Service Pack 1 is collection all updates rolled to Windows 7 till now apart from those two new features.

RemoteFX introduces new set of remote user capabilities that enable media-rich user environment for virtual and sessions based desktops.Dynamic Memory enables servers running  Hyper-V for server virtualization ,to be more efficient in use of memory.

You can download this Release candidate without /with registration.

Download Windows 7 SP1 RC