Surface release strategy
I personally think June should become the month when Microsoft holds the special "Surface" event where they reveal the next RT & Pro. The difference this time being they immediately open for pre-orders and shipping within 2 weeks.
How I see the next iterations(in terms of new specs).
Surface RT 2 - nVidia Tegra 4, 1080p, pen input, 64/128GB storage, 10 points of touch, hardware orientation lock
Surface RT Mini - same as regular but 4:3 similar to iPad Mini in ergonomics
Surface Pro 2 - Haswell SoC, 256GB storage, hardware orientation lock
I won't hold my breath.