Intel gave all signs of dropping Sandy Bridge chip development a while ago, but the older-generation architecture hasn't breathed its last yet.
According to Intel's Material Declaration Data Sheets (MDDS) database, one of the two unreleased CPUs is the Celeron G470, based on SB and featuring a single CPU core. It has 1.5 MB L3 cache, 35W TDP and a clock speed of 2 GHz. It seems to have the modest Intel HD graphics IGP (integrated graphics chip).
Celeron G470 will replace G465 and will have the part number BX80623G470.
The other CPU set to debut sooner or later is an Ivy Bridge called Core i3-3245, with two cores, four threads, clock speed of 3.4 GHz, 55W TDP and a cache memory of 3 MB L3. Its IGP is HD 4000.
It will have the part number BX80637I33245 and will replace Core i3-3225.