From the SEC filing:
In addition, our planned acquisition of National City presents us with a number of risks and uncertainties related both to the acquisition transaction itself and to the integration of the acquired businesses into PNC after closing. These risks and uncertainties include the following:
Completion of the transaction is dependent on, among other things, receipt of regulatory and shareholder approvals, the timing of which cannot be predicted with precision at this point and which may not be received at all. The impact of the completion of the transaction on PNC’s financial statements will be affected by the timing of the transaction, including in particular the ability to complete the acquisition in the fourth quarter of 2008.
The transaction may be substantially more expensive to complete (including the integration of National City’s businesses) and the anticipated benefits, including anticipated cost savings and strategic gains, may be significantly harder or take longer to achieve than expected or may not be achieved in their entirety as a result of unexpected factors or events.
Our ability to achieve anticipated results from this transaction is dependent on the state going forward of the economic and financial markets, which have been under significant stress recently. Specifically, we may incur more credit losses from National City’s loan portfolio than expected. Other issues related to achieving anticipated financial results include the possibility that deposit attrition may be greater than expected. Litigation and governmental investigations currently pending against National City, as well as others that may be filed or commenced as a result of this transaction or otherwise, could impact the timing or realization of anticipated benefits to PNC or otherwise adversely impact our financial results.
The integration of National City’s business and operations into PNC, which will include conversion of National City’s different systems and procedures, may take longer than anticipated or be more costly than anticipated or have unanticipated adverse results relating to National City’s or PNC’s existing businesses. PNC’s ability to integrate National City successfully may be adversely affected by the fact that this transaction will result in PNC entering several markets where PNC does not currently have any meaningful presence.