AFAIK just the individual mandate. Is that any different than what the House bill proposes to delay? The "whole law" has been in effect for four years now and it has been funded so far and the infrastructure of the unionized bureaucracy has been under construction for four years.
The "whole law" was never scheduled to go into effect immediately. That was by design, since the 2010 midterms and the 2012 presidential election were still in the future. What is at issue now is the main implementation phase, where ordinary Americans sign up for it and actually start paying premiums or collecting means-tested (not — the computers to test means are not ready) subsidies and begin to receive benefits, such as they are.
Reports I saw just said that the House's bill would delay the main implementation phases starting on 1 Oct and 1 Jan (the mandate) a year and would also repeal outright the disastrous 2.3% excise tax on medical devices.