No, it will not. You'll have to back up your data, move the drives (or possibly the whole MD1000 if you want) to the MD3000, recreate the raid set and restore your data.   There are a few other things to check as well (e.g. Maxtor SAS drives that may have come in an MD1000 will not work in an MD3000). You can find info in the hardware installation guide(s) here: [URL] If you have an MD3000i, the expansion rules are exactly the same for that system.
I have an MD1000 that I want to replace with an MD3000.  If I put the drives from the MD1000 into the MD3000, will the MD3000 recognize the existing virtual disks? 
moving MD1000 disks to MD3000