From an interview with Tyndale Publishers, Randy Alcorn answers the question, "What will Heaven be like?" See Randy Alcorn's book Heaven for more information. 

Someone recently showed me an article from a reputable Christian magazine that stated we will not have physical bodies in the future heaven, based on an (incorrect) understanding of the reference in 1 Corinthians 15 to a “spiritual body".

Unlike God and the angels, who are in essence spirits (John 4:24; Hebrews 1:14), human beings are by nature both spiritual and physical (Genesis 2:7).