And that's the most important points:
"... Currently, we’re hard at work on some aspects of and finalizing the plans for our PTC Mathcad Prime 4.0 release and beginning to map out the subsequent Prime 5.0 release. But before those are released, we’ll be launching PTC Mathcad Prime 3.1.
PTC Mathcad Prime 3.1, due early in calendar 2015, is an intermediate release. While we are developing some of the larger components of Prime 4.0 we are releasing capabilities that allow PTC Creo users to better access and leverage the benefits of PTC Mathcad in their existing workflow, which the PTC Creo community has been asking about for some time. There are features in PTC Creo that enable users to calculate parameters but PTC Mathcad is specifically designed to do that job. PTC Creo users want to take advantage of the benefits of PTC Mathcad to calculate and, just as importantly, document the reasoning behind those calculations within the PTC Creo framework. PTC Mathcad Prime 3.1 will introduce a powerful new integration that will allow PTC Creo users access to the features of PTC Mathcad that they’ve been asking for directly within PTC Creo, embedded within their existing workflow. We talked about that integration in a previous blog and will discuss more aspects of it in future entries.
PTC Mathcad Prime 3.1 will also include a completely rewritten API. The API is used to integrate and automate PTC Mathcad with other tools and in many different company processes. The API in PTC Mathcad Prime 3.1 has been re-written from scratch to be more efficient and easier to use. It also adds important new features like the ability to get and set data in different units and an event handler. We’re developing an extensive SDK with documentation and a number of worked examples to make designing your own integrations as easy as possible...
... So what’s next? We’re in the final stages of prioritization planning for PTC Mathcad 4.0 and our development team is actively working on the larger projects. We’ve been using our customer feedback to identify those functionality areas that are most important to address. The prioritization process candidates we are selecting from include worksheet protection, Area protection, Area locking, copy/paste multiple regions to Word (or other external applications), the ability to save a worksheet as a Word document, the ability to save a worksheet in PDF format, plot improvements such as title, grid lines and 2nd Y-axis, ability to wrap long equations, and general PTC Mathcad areas of usability improvements. As well as this, we’re in early discussions on how to reintroduce calculation server functionality that would serve the same use cases as it did back in PTC Mathcad 13.0 while utilizing the power of modern computing infrastructure.
After the prioritization phase for PTC Mathcad Prime 4.0 is complete we’ll tackle PTC Mathcad Prime 5.0; and though it’s in the early stages of that release one item that is on top of the list is Input Controls. This is a large project that we’ve been discussing specifications for at length. As we continue to populate our enhancement database the picture of customer prioritized items will become more apparent but we already have a good idea of what people are asking for. Text styles, hyperlinks, program debugging, redefinition warnings and scripted components are popular items and will be considered side by side with other areas of functionality that we have feedback on and will continue to receive as we talk to customers in the field ...".