Steam announced to offer new deals everyday starting from today. A new deal would be available after every 24 hours at a discounted price and these deals are not to be linked with the Weekend/Weekday offers on Steam. You would have received an update on your steam client about the new deals feature.
Do join the Twitter and Facebook pages of Steam for daily updates and notifications on Steam. Along with this, Steam has already announced its first Daily Deal off Operation Flash point: Dragon Rising which is avilable for 75% Off. You can grab it here.