Just wanted to point out that there's actually no reason to switch if one's already using TrueCrypt. TrueCrypt's still perfectly fine, so if one's comfortable with it, switching would be unnecessary work.
But why, as VeraCrypt is a clone of TrueCrypt which has the same UI and text within the program. Moving to VeraCrypt makes sense, it is a active program, still open source and is based off TrueCrypt.
It even states on the old TrueCrypt website "WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues" and "WARNING: Using TrueCrypt is not secure and you should download TrueCrypt only if you are migrating data encrypted by TrueCrypt".
Yes it has been audited and looked at but why bother encrypting your hard drive with a dead project, at at least keep the peace and mind of using an active program, meaning if any vulnerabilities happen to arise an update would probably come out, unlike if you were using TrueCrypt.