On the day that IDC reported that Apple regained 4th spot in the US PC market with a 4.5 percent marketshare (turfing IBM/Lenovo down to 5th), Think Secret reports that Apple will update its iBook notebook lineup with a widescreen model in the upcoming days. A 14.1-inch widescreen model is expected and could be followed by a 15.4-inch model in 2006, if Think Secret’s sources are right. The article is light on details but the speculation was triggered by the fact that there have been no iBook updates since early this year.