P155 is more than 4 years old at this point and way overdue for replacement.
What to (reasonably) wish for: The P2020 - fully sampled, superb sympathetic resonance, continuous position sensed keys, killer rare earth speaker system, lightweight & gigable, room for 50 free downloadable voices, not surprisingly fairly inexpensive due to mass marketing and the computing revolution that's been going on for the last 20 years making the design of a decent DP fairly trivial at this point.
What to (unfortunately) expect: The P155.1 - two fewer buttons, one less character in the 7 segment LED display, even tinier sample set realized by a crack team of 100 engineers working day and night to stretch and bland out the loops more than ever thought humanly possible, inexplicable slight price hike over the arguably slightly superior model it was designed to replace. Did I mention the new paint job? Woo hoo!