Got this email info from NATP today
Form 656 Revision
The IRS has revised Form 656, Offer in Compromise. When submitting an offer for your clients, the IRS advises the March 2011 revision of Form 656 must be used. Beginning July 5, the IRS will not accept outdated forms. If an offer is submitted on an outdated form, the IRS will return it. The IRS will only return Form 656, not the other forms contained in the offer. This is not a rejection of the offer, but rather a request that you submit the offer on the most current form.
Form 656 Revision
The IRS has revised Form 656, Offer in Compromise. When submitting an offer for your clients, the IRS advises the March 2011 revision of Form 656 must be used. Beginning July 5, the IRS will not accept outdated forms. If an offer is submitted on an outdated form, the IRS will return it. The IRS will only return Form 656, not the other forms contained in the offer. This is not a rejection of the offer, but rather a request that you submit the offer on the most current form.