There will be an i3. There are plenty of uses for dual core parts. Intel primarily sells them to get something from parts that aren't good enough to sell as an i3 or higher (too many failed cores or wont clock high enough during testing). Especially early on when yield is worse, getting $70 is better than $0. Similarly, selling 'F' models lets them sell parts with defects in the iGPU.
Alder Lake for desktop is....
i9-12900 = 8P+8E (24 Threads)
i7-12700 = 8P+4E (20 Threads)
i5-12600 = 6P+4E (16 Threads)
i5-12400 = 6P+0E (12 Threads)
i3-12100 = 4P+0E (8 Threads)
Pentium = 2P+0E (4 Threads)
Celeron = 2P+0E (2 Threads)
Raptor Lake for desktop will be... (Q3 next year)
i9-13900 = 8P+16E (32 Threads)
i7-13700 = 8P+8E (24 Threads)
i5-13600 = 6P+8E (20 Threads)
i5-13400 = 6P+4E (16 Threads)
i3-13100 = 4P+0E (8 Threads)
Pentium = 2P+0E (4 Threads)
Celeron = 2P+0E (2 Threads)