question about Neon SIMD support(android)

[mrtegra2]

Hi im using a tegra 2 based phone without NEON SIMD i have few question here which i think it will be useful in the future

1.what improvement by using NEON simd? is FPS,audio,video or better fps with audio?

2.will tegra 2 based device without neon will be able to play games full speed with audio in the future?

3.the cortex a5 have 128bit NEON simd vs cortex a9 64bit NEON simd,will the cortex a5 will have better perfomance on audio/bgm?

4.will the dual cortex a9 with 512mb ram enough to run PPSSPP full speed with audio in the future?

5.is there any quad core support? that will be huge impact on FPS right?