For most REALbasic users this change won't require much, if any, work. When we ship a 64 bit native version of REALbasic, integers will be 64 bits rather than 32 bits. That doesn't mean much to most of you. For those of you that are doing bit manipulation and using certain classes, it will most likely mean your code will need to be updated.
Today you have the ability to specify that you want an integer that is 32 bits or 64 bits. Rather than using Integer, you can use Int32 to specify a 32 bit integer. If you are reading and/or writing integers using the MemoryBlock or BinaryStream classes, use the methods provided in those classes to read/write 32 bit integers if you are using the regular Integer methods today.
If you are doing integer bitwise operations or are using integers with binarystreams or memoryblocks, you can update your code today so it will continue to function properly once we provide the ability to compile your project as a 64 bit native application.
64 bit is something we will be addressing to allow your applications to be 64 bit native. I don't have a timeframe to announce just yet. However, those of you that are depending on 32 bit integers (and if you are, you know you are) can update your code now so you won't have any hiccups when compiling 64 bit native applications arrives.