i like the travel of the 2008-2011 but the 2012-2015 is not bad either would be my choice.
i also want them to fix the arrows, bring back the inverted T, its used for homing when heavy arrow usage is happening also statistically up/down are used more than left/right so its illogical for left/right to get more prominence.
function keys and escape are a must, whether its a new MacBook keyboard or an external they should put the touch bar above function(s)/escape if they insist on it still existing.
power button(or eject if we are talking external) should also be a touch ID sensor.
i expect none of this based on the last few years of Apple's neglect, but i can hope.