I work with Adobe InDesign CC 2015 on Windows 7.
I'm developing a digital magazine for iPad and Android tablets.
I don't have an Apple or Google developer account yet.
Until the accounts are created, is there any way to preview the articles or the collections on a real tablet without signing the app?
Ok, I totally missed that you said article and collection in the title. Lol. Oops
For iOS you need to have a developer account so you can create the mobileprovision file and certificates to sign and install the preview app. For Android you do need to have a certificate to sign it, but you don't need a developer account to do that. You can generate a certificate using the keytool app that comes with Java, sign your preview .apk file, and install that on your Android device.
All iOS signing needs to be done on an OSX machine as the tools to do it are unavailable on Windows.
Is it possible to certificate and sign an iOS app in Windows 7?
Are you using the beta of DPS2015? Or the current Digital Publishing Suite project?