If you aren't interested in this month's LESP rewards or you already have them, you can put the LESP credit associated with your regular credit purchase toward next release instead, but only when it is available. Here are a few points of interest about it:
Simply select "Yes" under the pre-order options menu to see what known rewards are being offered next month.
An LESP released in the middle of the month can be pre-ordered as well, and Guaranteed Superb LESP credit will usually carry over for that month. This means that ordering early in the month may earn you free superb LESPs of the mid-month release. This will be reflected in the pre-order's preview info.
You can read more about Guaranteed Superbs here.