"Counter-Strike: Source has more HDR-enabled versions of maps on the way, along with some enhancements to the game itself."

i think they are probably talking about the source engine update, currently in beta

here is a rundown of changes so far in the beta:

Source Engine
* Bloom (HDR level 1) supported on DX8 cards (previously, dx9-only)

SourceTV
* added SourceTV port and delay time to "status" output if SourceTV is active.
* fixed SourceTV relays unabled to connect to "sv_lan 1" servers.
* fixed SourceTV reporting correct password restrictions.
* fixed SourceTV bots joining game even if command line specified "-nohltv".
* added new command "net_status" that shows more detailed information about total and average packet loss, latency, packets/sec and bandwidth.
* added convar "tv_autoretry 1" so relay proxies try to reconnect after connection crashed/timed out.
* added convar "tv_timeout" to specify connection timeout limit in seconds.
* fixed disappearing weapons in SourceTV.
* fixed spectator chat on relay proxies.
* improved spectator client dispatching, faster and better balanced.
* fixed SourceTV crash during changelevel.
* fixed command tv_record chrashing relay proxies.
* reduced SourceTV CPU demand.

or i wonder if they have done something else,
like:

the sheild?
quickswitch fix?
more player models?

time will tell...
sooner or later, ..
time will tell.