Storage Technology Corp is still having to backpeddle on its Iceberg storage array promises, and the Loiusville, Colorado company yesterday warned that the product might not add to revenues at all this year. It does still expect it to make a significant contribution in 1993. Chief financial officer Gregory Tymn told a PaineWebber growth stock conference that the company currently expects to post between $0 and $50m in Iceberg revenues this year. StorageTek said last month said it probably would not register the $50m in revenues from Iceberg in the fourth quarter that it had projected. Software problems forced it to delay shipments.