H-1B Extension Beyond 6-Year Limit in 3-Year increment

Hi, I've see this in one of discussion forums. Do you have any idea on this. Please share here if you know any updates or changes on this. "Availability of H-1B Extension Beyond 6-Year Limit in 3-Year increment: H-1B extension beyond six year limit is available only in one-year increment for those whose visa numbers are available and who has filed a labor certification application and passed 365 days before reaching the 6-year limit. However, the rule is different for those who need extension of H-1B petition pending the labor certification application or petition or application and for whom visa number is not available. During the period of the visa number unavailable for him/her, he or she is eligible for H-1B extension in three-year increment. This difference can be important to the employers because of the outrageously expensive H-1B filing fees and cost." Thanks, vdesi