Question:
1) Concerning hardware: - On which edge of which signal is the data sampled in the MVP?
2) Concerning software: - For a XPT are the packet busy and packet complete interrupts

Answer:
1) The data is sampled on the rising edge of CLKOUT for 1 cycle/column accesses and on the falling edge of CLKOUT for 2 and 3 cycle/column accesses.
2) No. Look at the column time status code (010101) XPT Complete to detect the XPT completion.