@EvilDragon You shouldn't just ask the preorderers, if they are willing to switch, but rather give options like:
- Yes, I switch
- I switch, unless you don't need me to
- I stick to 4GB, unless you really need me to switch
- No, I stick with 4GB
Or ask for a number on a scale from 1 (sticky) to 10 (switchy). That would give you more control over the amount of people switching - making it fit batch sizes better - while taking into account their willingness to switch.
And of course, you should ask, if they'd want to buy the 4GB board later in case of switching, and, if they'd rather settle with 2GB or with a refund in case 4GB doesn't work out. That be usefull knowledge.
If anyone must know right now, I'd go with "stick, unless switch needed", "4GB board later, in case of switch", and "2GB over refund".
In case of switching I'd be willing to pay production costs, shipping, and some processing fee for my 4GB board - unless the switch wouldn't change the article price (then the 4GB's production costs will do). Point is, I don't want ED to pay for my stuff, neither in money nor in extra working hours for extra processing. So my suggestions are subject to asjustment, if I missed something.