Anna Marina,
Not long ago I saw Stephen Lett addressing the youth on JW broadcasting. He said the memorable words "your descision (to serve) will make Jesus happy, and more important, Jehovah happy" lol.
I doubt JWs will be called preterists. They believe unlike anyone else that Jesus became king (and king with little k, Jehovah always take the spotlight) in 1914 but he did not really end anything there. So I doubt it could be called Preterism.
In Preterism, we believe all or almost all prophecies were fullfilled in AD 70, AD 30-70 being the last days as indeed the new testament writers speak of their day as the last days, some believe these 40 years is the Millenium. Some believe the second coming took place in AD 70, some only a judgment coming against Jerusalem, some believe the resurrection and judgment took place in AD 70, some expect that to be future not so much because of what the Bible may say but because of the creeds, some believe the Bible speaks of a literal end to sin and evil, som dont. I believe the Kingdom is gradually expanding and an end to sin and evil in earth. I think the heavens and earth is the church and the hope of heaven. Christianity has traditionally believed Jesus was King from AD 30 and that his church is the Kingdom. I know some Catholics Preterists have given special signficance to the reign of Constantine. JW is a Restorationist group like the Bible Students, believing that a restored gospel needed to be preached to save people (God failed in his first shot in some sense), therefore they place the Kingdom in the yet future or in JW case 1914.
I think Luke 12:4-5 and Hebrews 10:29 especially had the last days in mind with its Pentacost and the later judgment upon old covenant nation but of course there is always a reason for fearing God.