Just for the price discussion:
4GB will be ceaper sooner or later than 2GB. Yes. Because of manufactuing numbers and stuff like that. It's already not that much more expensive.
As for RAM bandwidth, sense or nonsense of eDRAM or ESRAM, TFLOP/s:
That depends on the specific architecture!
Do not compare Wii U's very likely 352GFLOP/s to whatever Switch has.
Best indicator right now is Mario Kart 8 as it seems. Even in handheld mode it performs with constant 60fps instead of Wii U's 59 frames. With 720p.
In home console mode it's 1080p. So even if Switch only has 384GFLOP/s those would be worth way more than Wii U's 352. Because it's simply not comparable.
You could as well look into PC-benchmarks and see the same.
About the rumours:
Eurogamer's source is probably month's older than that Foxconn leak. Either might be right or wrong. But looking at how late hardware often get's finalized i'd probably go with the Foxconn leak because it's the newer hardware iteration.







