Actually Anteprima, G-Star Raw, 33 Thirty Three were already on sale since last month (since late May 2012 on selected items) so this is probably their way of announcing it officially or more items were added to the sale (do not there are still items on regular price).
Oh and do bring along your Citibank Credit Card to enjoy additional discounts.
Anteprima, G-Star Raw, 33ThirtyThree GSS 2012
Promotion : Anteprima, G-Star Raw, 33ThirtyThree End Of Season Sale 2012
Location: Anteprima (ION Orchard, Paragon), Anteprima Wirebag (Isetan Scotts), G-Star Raw (ION Orchard, Paragon, Isetan Wisma Level 1), 33 Thirty Three (Paragon)
15 Jun – 15 Jul 2012
Time : Store Opening Hours
Admission Fee : N.A.
Selling Point : Up to 50% Off (from what I saw previously) plus 10% Off Regular Items & 10% Off Sale Items for Citibank Cardmembers.
Enjoy Your Great Singapore Sale!